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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c302beaad2d15713f7baa2afd70a19a89d42498f8cbe53548b55e8a95119503' 
  AND token = 'VGbjkZ3a49QGxXnlTKR090N1MOA33PrpbqjrDz38lWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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