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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b011574355fc51e30756c45a2f4706be1c0ea7c32cc2f6efce1db565a29167' 
  AND token = '4s9VvEeP3TujtaE6n1QUCrxa7rvicsSepH20Oc9BRWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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