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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca42c65b4c79f547ed9a6a0c4331004f1032d93793434c990f1cbfe84414fc7e' 
  AND token = 'AXuk5WrgoCzDBftDC1y+1zE4VN9FxGUy61KTZZJc/XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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