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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92635b05398bcf7ec0340aa3e5e491b7971506a93444efd06e5ca8cb9488b84b' 
  AND token = 'cs2CMFN33I3+BE+kze330y2Fk/7yCIHbs5CvWD9i0b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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