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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957b14c6ff77be6cb78c3e696fe77fe8e53b811e77420cdba6317cab5d02a02a' 
  AND token = 'wuwQni4dBClMeXCwTD1L0Nra/LjdvQUizva9Zd8ZsKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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