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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cea6b6b0c0099b8cf4efb1f65b0206fb75bc95beaf8ee32809d221904ba75e' 
  AND token = 'c2GRpvvC9vtH/fE74lFuu6EcB6lfaWtnyhbQtBVNemQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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