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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80e48881d0293a177f83630f58aefa6ac4d9a7d576b55994cdeb161a66ae17a' 
  AND token = 'g1N61XyvVb4GwVJJrbPD6xJLMSGpc9NkbZfYwfXG+Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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