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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2dc9ba48d13647228f2bae42e53fc117404f06038b330938a3bcd0d472dec68' 
  AND token = 'dpBJU9MUbgMCGUUo+uJIH/PYCidl+FOyYZUpFXtebbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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