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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b953840ac2e53fa3ce7eb063045f3c84fe745e336fc1e0638e4da30884f6980' 
  AND token = 'OPeAVveL37fTHCVphR2TbEY8ZtNhQmp28X8GWpyQXr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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