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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdac92121747f73e28befdac8a07bc6c8204e513d17ae0b690955958d3142d6c' 
  AND token = 'z/Jr1StLbRn7bK7siTjzly5Fz5mBBxYBlbtNRHN/HU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}