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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba180b7a4d31989b7f183652c3dcd609aef51bcb88890cf4b88130d62c0f23a6' 
  AND token = 'sRK1XbXXcxOipEi2I0R8HJW7VS166Pt8aw/LcJRDGvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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