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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ea69f13f799add38e65fc01e2caf91cd1e586700cac409c1bca0df16d804f4' 
  AND token = '7Si05VCjj8vmmbZh6CV0CMZusOkw7M0xckMIcinrAFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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