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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6af99b1b183806c64385cd0f7fa8957d49f434199e8d57ba849c407f6fddfe0' 
  AND token = '9E6GSwm4Oip5G0HgGu/L3uwyp6lSMi1dtgbG5YExra4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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