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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b69a4f3dc8f10fcd925c9265708fcc35673233bc2e19eea92672eac401ff115' 
  AND token = '5ms221SKcRIQi6YLyZ3sSUItM2QtFXHAHffmBi7r4+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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