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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909af089af425e9977a25d057dd229023c4ec534d122b3eb377a2b22d3660a2c' 
  AND token = 'lHkbnpjDAnJRwGff2R99cmsL+UsE2RwU2Do4Gudfvfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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