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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c212e88ecf528c034a85087ccc9176c9ed42397a17ce0f7620beeca9423e9c59' 
  AND token = 'G6w9UljCKPsHv3dtskOsdDGas+HA84bu8tnmZwN8qzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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