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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89dcbe77fffcf0671bb84a03e4661562bb352c3df6a548aa57dc3a7bd20502a0' 
  AND token = 'lpMBcwD3Cf8yQ0B8y5PoqWdtM5wCdMQvc/J406cLlwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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