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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9db999e88496c722c690de7c98c6ba58eeb694cf062e8c70c9fc1b0b638f96' 
  AND token = 'JlnS1XfmkeFlGkK/yaVRU5dPSW19r4kX4UaiOZkqjKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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