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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b07d707789d8d51c09df118b36f440e24b2cf46aca8bd9873b040215364051e' 
  AND token = 'UOuCGtDMwWAuR7NIN1ix5+fS7Gm5WyTMx+0/1ET647E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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