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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94595276a258e6d1755e79ec569d7414a81ab1f7a742dd3e956b78a60f2b3238' 
  AND token = 'FyNWSah6fFg9GLnfiBoj9HDk83zO2m3IltRy6WEeFeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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