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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1caff93aad266b2a1a8c78ca895bd97f0b6527281cc2df8c9f1ce6c7f92584e5' 
  AND token = 'vZq9AlLVPOD+r3nTC+RFRsg9dmFDafT/Y7jqigRxn30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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