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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bb6dc2e222854d4ad170c0b6deeeee42ec93b843c8b456944b02b66e8d238c' 
  AND token = 'U+A5wHSY9UdhVA2vMJ6TmDdHF9L/hmADpuax4f0RNFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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