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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d37fbe0cb5f345e343ec0a78d33754253fe45f4375960a44c8c7b83ebf07f14' 
  AND token = '47ynyWnyFvExPXoG2y+8NQHJLp99rt1LumO+m1aSABc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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