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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd399f37952b09742b95e79663f215149fc9d3ee46ee81c7ae40dab8b70cdaede' 
  AND token = 'FfyXpdq4aVyAVqSUVsowfcrv95ph6dItzcRu0Ia4cCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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