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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8a298ea97e5129876a1182c5bb861cc6f38ad0d076b46d706f041ad0449cd7' 
  AND token = '7dzhAyAJ6He4Bh1b+iiyteK+XXJvaGGkzaM5yfLpMMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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