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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f0bf6741fe0c11a9d4311b68fddf67851fa9c73d50f23f5cdfa12db54ef10f' 
  AND token = 'CeAU4BIfGnEGa9eL0zrPSwH7XVFZkKFnRoMhCAVkT3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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