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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4008eea0ef8ecfa0ef7b1c8d3ff2dbdcffb7b9e8ee562eaf42e8f87a82dd82b6' 
  AND token = 'ssEjB5TPiiiu1/fdwEynIH/lP2JXqh68zWlb1hPjzgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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