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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4feb70c33c2d8ebec9de43b14f189192c95f78e35e90eccca2f62012dda9d44' 
  AND token = 'E5wif5RNCvkZSLAAuVB46GFpuKLES+bKCU50XizpDmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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