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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f38fc5b0ea47de222dfa594f9cda6fd0fb3f5c7312215602132d929b1c8d767' 
  AND token = 'NvAb3S0cCnaUpNFME+iQ0EDgOSJ3MrCpM4fmPPZ0BQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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