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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58557dc72933eafda2c056d7d17c1db114a8e457214576be739e11f65bf15713' 
  AND token = 'kXOTxUk08BexHiFgaERhmdvEdBNE1zYCkb7kmSby1a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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