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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee273e753fb1b11935d86943995a2397e19836f74e86fe53a5f47d421eaf243e' 
  AND token = 'FGmKjOldOC5kisJml/vWCP+r8F0P+7Wmzt/WPyftQHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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