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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783457d4fb6b9362b580707a934260bac64e71f939d19f56897fb6636e754db6' 
  AND token = 'SGBMi4yFhfSmxd6s8vTwVMAwNEec3nGCjETM7S64j1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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