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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68009c1688a6e7b8c60c7bcde8c0362dbea755d2f9a83a772566a126fcd37838' 
  AND token = 'sAZsIc1Dlqnptq9/QPptFM1kscQdmASU798JcofPuc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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