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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb889e52288bcd80b4a0909d485e8b697808ac263f0691fb761b7748ca33a6aa' 
  AND token = 'jyOAw6lKcn5uLGjSjcfaq6dV03wVldA+phkDRhBv1Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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