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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acff0d357c02ec0b36faa8882b4b8d6f5ff42650c79b381d4f5c45aecac4bcac' 
  AND token = '0prXx+DpuEPqdSFA1GYk7ti05/WCbf/CxtonPkltA1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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