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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b1bbe18e1ebc16b64e1feb1fe59bd302cb852cc77c796204acaaae3474b3f0' 
  AND token = 'xfKpDAZO3PqXIZ3evTefdm0dOUPTSvbEGjQvI7r+zXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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