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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead558186a27aba768300ad4343adf5df344da03c40201b082998cb5c65bba3a' 
  AND token = '9x7MW9x55Yq+B58dgIt80eKL+3PKQf5GZjx9cxJiz8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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