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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51fd3540d746c6e564fe54c21257766b4a746636cc8d5248c5f9fb774e1b2dfa' 
  AND token = 'PxI28Q9rUFTMunqDa2z22X8C9+G1lvWKzh7abc95kzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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