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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070b8b25fd34e72ab72dc85665f5f5a5d58783d4883201a2a9015dd5ce9bd8dd' 
  AND token = 'XIEMaxK3VonEYwF8T3t4IEvmPEgvYbniX/ElAfBR96A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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