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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d0933d0521c4b5aa1a0e18ea2e17f61d0e55e0765894c45c929c7548af4ffb' 
  AND token = 'pCFrqA85X+sPCOpp3cAiN4ixCdNHoETZN7yL147+smg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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