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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede44d9fe7952cec4f229e4f8110f82c5b72da50a977b0a743611df23abd98a6' 
  AND token = 'LFPFQPabMarUNr57sSGOI4f+482O4G6ucHHHrFFKIRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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