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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30acd1a681f07209a15f6ba48c4a1438a8f5e7bae0416eed6193d128bba65ff' 
  AND token = 'XTruFTC6RALCG0ILgvLxQezMoVXPubmI67xI/MvTDv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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