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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8e9a31154e6a44dba5a7e8c34005b5a28669e142a04d062fc2d41fca88f7fb' 
  AND token = '7ydvF9a0t5OIL8yd9i8loZ3pVFDyza0CLChQ710ahMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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