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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93994342df526450a2a3af48311d4d4eb27f7561b9b8f8f81e8f6ca5817a9462' 
  AND token = 'pLf9HKyO1M0p1U72QVggTclgH/sNCdkfVjSsgb+3GPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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