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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d904f89c28b2b1724f7c0f181449825c1d16e64d238abb656ce8a10f6c244d' 
  AND token = 'nnkoTdWTc+rZDRSFErSODA5jlHSPhg/1Fl5YZAkI/0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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