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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b10d3be4510a570fe6bac1c0ae66e62b437a2e69c1a6f7b95e9e5da36ca236' 
  AND token = 'CESf7g0QEmsZ8fdJJfol5gNI/z9Z/nl1FznYcRjcZ0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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