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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a2f88f6ea93195a5006139bd9181a7268355919d3a95cae858793d520f5631' 
  AND token = 'mDqJW9tFr10snH1vVdOipkU/JzedGud1aBcmXA1PJWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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