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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f783969c10ac5e004162d2dd7cc19fdc2c5bc3335f580b60c9ebf07814c8f5ee' 
  AND token = 'gX6eUkshkkmHv0apZ4EIn+OuhjaMeDCs55yp86n5ZbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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