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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067ece4009f848caa4cf66b48e9166fdde7d4d524d77a56d96e6679da0fe4177' 
  AND token = 'fnn1VwBvHzQM+1sOFzgZd1bL8UCksX2ieYrC7QoigiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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