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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53a66ca1ff220270fc93752ae69b56a560a87cff9fbe78a7c35b44b431c17676' 
  AND token = 'pNaleb/HODMFBXy89+YPCmbU2r39S+nI1hV8U/Yggt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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