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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998bf6d1fdac9d949d513b17c28ec6814507a94a28131f1d6c5b4a3ba39856ab' 
  AND token = '60FkLGK7Kj7gPWYVnEItKL3MXgmkckdUIz3lxxUM34Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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