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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00df662c3b4f67686f619b07ffaa53e97f73add7fe39c6d43b2bfa4e3e9552f' 
  AND token = '9j/FNRCV/FgwS77quobayQPv8wrWqMv6/6C53H6JuaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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