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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804327e0138ab6508db54c4a6982ef587f597071f315a2fac51b27f65f50f8bc' 
  AND token = 'VZ2QlDd/g3F0SPJcysXro8DY52Mnyg3ws+Wlz/mTekQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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