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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abdba617b56cab5ee993110c6a4e4ff21e4b1c73d73bb643738c3a5f6a2b3a6' 
  AND token = 'Z7Dz4uYHrRE23UMI+BprbNvziUAFRPd4VbMC5ED9Ask=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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