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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07e35d72c3c36bc4d37715069dc75798bf52db59c6c0e220be3109bbdd354c1' 
  AND token = 'osNojXG7M5QIYEQ3C8hhVYHp1BSbU2hF271NPADCyEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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