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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00c2de05bb211dcaa691e41f0bb55fe3e8b9257740c02530c0a80a528dbc749' 
  AND token = 'kryevR7Lfx7z8XGDxSSCoCaZitp9a9dQquHVhrxQT0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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