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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ef0de6d92996a143b5ee6076984a42a3feba4457b351dbb9e6c5917d2c2862' 
  AND token = 'OdHpjNAwAEVqbfOvdU3IrdsDSledXrluV9P5uIsQE8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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