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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc97e6e1adc1e8c9b07fc1799d14754726fe14e8b2b9505366ca27fff4bcbe43' 
  AND token = 'TTlhpXfDGJlV9qm6y4Ep8weSAL7L8HbUT08s2qT9TRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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