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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3731572472e70fd6ef6ae806d51cb6913e4040f0c660e4f17cf2869bd4cfe61' 
  AND token = 'eKYyl2ZA1/ZbGTSGwEF12RvEWY4mOupNKsNXLFOl3UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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