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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7c1f7c914c9c7443cf49bfbb9c1e44eed894d66d9fb29b49f5233b88007bcf' 
  AND token = 'Fo/2hPL83R+lSGFVig7C7fs/rRPA0UgVLrfGeIs5LpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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